Question

Buck Converter Question

Q3. A Buck converter is used to produce a regulated 10V, 5A DC power supply from a variable DC source with an nominal input voltage of Vin = 20V±5V. The Buck converter switches at 250kHz, and operates entirely in the continuous conduction mode. The output filter capacitance is C1.0uF 3.a. Draw the circuit topology for the Buck converter. Ensure that your circuit includes the input DC source, the output load resistance, the switching devices (i.e. MOSFET and /6 marksj 3.b. Sketch operating waveforms for this circuit over two complete switching cycles, showing the gate drive signal for the MOSFET, the current through the inductor L, and [6 marks,/ 3.c. Identify the duty cycle range that this converter will be required to operate over in order [3 marksj 3.d. Choose an inductance value to ensure that the converter maintains operation in the [5 marks) 3.e. Determine the worst case voltage ripple that will be observed at the output of the Buck [5 marks) diode) and the filter elements (i.e. inductor and capacitor) the voltage across the diode. to achieve the desired step-down ratio continuous conduction mode for loads greater than 2.5W converter

Answer 1